Cynthia Erivo's mouth has been insured for $2 million

Kamran Shahzad, US head of commercial, oral care at Kenvue, said: "We're ecstatic to collaborate with the iconic Cynthia Erivo to help consumers recognise the importance of mouthwash.

"Our new Wash Your Mouth campaign seeks to educate consumers that while brushing and flossing start the oral care routine, Listerine mouthwash completes it.

"Together with Cynthia, we're making a bold move to help protect one of the most recognisable mouths in Hollywood because we're confident that Listerine guarantees a healthier mouth."

Cynthia has always taken care of her teeth and her oral hygiene routine is a key part of her preparations before going on stage for her concerts.

She told People magazine: "I'm the geeky kid who was like, 'I'm brushing my teeth.' I don't think mom ever had to fight me to brush my teeth...

"Strangely enough, brushing my teeth and using mouthwash - Listerine specifically - for some reason, really opens me up.

"It means that I can breathe really well. It's the last thing I do before I go on stage. I just want to make sure that I feel really fresh. It sort of gives me a restart before I go on and sing or speak.

"I take good pride in [my mouth] because of my gap. I think what we tend to do is pick our outfits, put the make-up on or do our nails, which are wonderful, great ways to show who you are externally, but cleaning your mouth adds to that. It also adds to the confidence you might not even be able to see unless you smile."

When it comes to other forms of self-care, the 38-year-old star undergoes lymphatic massage to reduce water retention and cupping to "get rid of any toxins".

She said: "It's an arduous thing to do, but I love doing it because it always aids the end result, which is what you've seen when I'm in front of people singing or performing.

"It all goes hand in hand. Everything adds to the next to make sure that all the parts make the whole, and I can actually be present and do the work the way I want to do it."